It's always better to remove batteries from equipment if it's not going to be used.
Unlikely, but there is always the risk of leakage & corrosion.
Store fully charged, they won't be after a while in storage though.
Both battery types, LiIon and NiMH, it's OK to charge partially used batteries (but not for NiCd).
You will get better capacity with discharge/charge but remember a battery life is measured in charging cycles - so don't wear them out prematurely!
My preference for NIMH is to use Uniross Hybrio batteries and MAHA chargers.
The Hybrio batteries lose less charge than anything else I've tried, including "professional" batteries form Varta.
I use two different MAHA chargers for different jobs, I'm going to get another one because I use so many AAs in the two flashes.
The MH-C800 will charge 8 AA cells, and can also discharge and recharge once automatically to cycle the batteries if they've been part charged many times.
The MH-C9000 is an analyser as well as a charger, it can tell you what the capacity of a battery is in mAh ... useful if you have old batteries that you want to measure. It will also do multiple discharge/charge cycles to try to recover old NiCd cells, and it has a break-in setting to optimise the charge in batteries used for the first time.



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